An electronic device includes a display device including a display panel, a touch panel, and a touch sensing circuit configured to sense a touch input. The electronic device also includes an input pen configured to provide, to the touch sensing circuit, information on intensity of pressure applied to the display device. The touch panel includes touch pressure sensors and signal lines connected to the touch pressure sensors. Each touch pressure sensor has an area per unit length that increases along an extended direction of each touch pressure sensor. Each touch pressure sensor has a resistance that varies with an intensity of pressure and an area of pressure applied to the touch pressure sensors.
Legal claims defining the scope of protection, as filed with the USPTO.
1. An electronic device, comprising: a display device comprising a display panel, a touch panel, and a touch sensing circuit configured to sense a touch input; and an input pen configured to provide, to the touch sensing circuit, information on intensity of pressure applied to the display device, wherein the touch panel comprises: a plurality of touch pressure sensors spaced apart from each other, extending in a first direction, and arranged in a second direction, each touch pressure sensor having an area per unit length that increases along the first direction, having a resistance that varies with an intensity of pressure and an area of pressure applied to the touch pressure sensors, and having a triangular shape, and signal lines connected to the touch pressure sensors, wherein the touch sensing circuit senses a resistance change value of the touch pressure sensors, wherein at the same pressure of the input pen, the resistance change rate applied to one of the touch pressure sensors increases as an overlapping area between a contact surface of the input pen and the one of the touch pressure increases, and wherein the touch pressure sensors do not overlap each other in the first direction, and the touch pressure sensors overlap each other in the second direction.
2. The electronic device of claim 1 , wherein the touch pressure sensors have the same shape as each other.
3. The electronic device of claim 2 , wherein the signal lines comprise: a first signal line commonly connected to each first end of the touch pressure sensors and configured to receive a driving voltage, and second signal lines separately connected to each second end of the touch pressure sensors.
4. The electronic device of claim 2 , wherein a width of the each of the touch pressure sensors linearly increases along the first direction of the each of the touch pressure sensors.
5. The electronic device of claim 2 , wherein each of the touch pressure sensors comprises an n-th, where n is a natural number of 1 or more, sensor part and an (n+1)th sensor part having a width wider than a width of the n-th sensor part.
6. The electronic device of claim 2 , wherein: each of the touch pressure sensors comprises a plurality of sensor parts with different lengths and connection lines connecting the plurality of sensor parts to each other, and the plurality of sensor parts are arranged in the first direction crossing the second direction and the plurality of sensor parts are aligned at one end by a reference line.
7. The electronic device of claim 1 , wherein the input pen comprises: an input tip in contact with the display device, an input pressure sensor configured to sense a pressure applied to the display device by the input tip, a signal generating circuit configured to generate a wireless signal comprising information on the intensity of pressure applied to the display device based on a signal received from the input pressure sensor, and a transmitter configured to transmit the wireless signal.
8. The electronic device of claim 7 , wherein a maximum width of the each of the touch pressure sensors in the second direction is less than a maximum width defined on a contact surface of the input tip.
9. The electronic device of claim 7 , wherein a maximum separation distance between adjacent two of the touch pressure sensors in the second direction is less than a maximum width defined on a contact surface of the input tip.
10. The electronic device of claim 7 , wherein the touch sensing circuit comprises: a receiving unit configured to receive the wireless signal, a current sensing unit configured to sense the resistance change value of the touch pressure sensors, and a calculating unit configured to calculate a coordinate of the touch input based on the information on the resistance change value and the intensity of pressure of the touch pressure sensors.
11. The electronic device of claim 1 , wherein the touch pressure sensors comprises: first touch pressure sensors having a first shape; and second touch pressure sensors having a second shape, wherein the first shape and the second shape are different.
12. The electronic device of claim 1 , wherein the touch pressure sensors comprises: first touch pressure sensors, each of which extends along the first direction and are arranged in the second direction crossing the first direction, and second touch pressure sensors, each of which extends along the second direction and are arranged in the first direction and are insulated from the first touch pressure sensors.
13. The electronic device of claim 1 , wherein the touch pressure sensors and the signal lines are disposed directly on the display panel.
14. A method of driving an electronic device, the method comprising: generating a touch input on a display device by an input pen; transmitting a wireless signal comprising information on a pressure intensity applied to the display device from the input pen; measuring resistance change values of touch pressure sensors having a resistance that varies with the pressure intensity and a pressure area applied to each of the touch pressure sensors, the touch pressure sensors are spaced apart from each other, extending in a first direction, arranged in a second direction, and having a triangular shape; and calculating a coordinate of the touch input based on resistance change values of the touch pressure sensors and the information on pressure intensity from the wireless signal, wherein at the same pressure of the input pen, a resistance change rate applied to one of the touch pressure sensors increases as an overlapping area between a contact surface of the input pen and the one of the touch pressure increases, and wherein the touch pressure sensors do not overlap each other in the first direction, and the touch pressure sensors overlap each other in the second direction.
15. The method of claim 14 , wherein the measuring of the resistance change values of the touch pressure sensors comprises: measuring current values flowing through the touch pressure sensors, and converting the current values into resistance change values.
16. The method of claim 15 , wherein the calculating of the coordinate of the touch input comprises: distinguishing a ghost touch input from a valid touch input by using information of an overlapping area between a contact surface of an input tip of the input pen and the touch pressure sensors, and calculating a coordinate of the valid touch input.
17. The method of claim 16 , wherein each of the touch pressure sensors extends along the first direction and the touch pressure sensors are arranged in the second direction crossing the first direction.
18. The method of claim 17 , wherein a maximum width of each of the touch pressure sensors in the second direction is less than a maximum width defined on the contact surface.
19. The method of claim 17 , wherein a maximum separation distance between two adjacent touch pressure sensors in the second direction is less than a maximum width defined on the contact surface.
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August 25, 2016
November 26, 2019
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